NOF9 will not open my site made in NOF9.....says it needs a later version to open it.

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NOF9 will not open my site made in NOF9.....says it needs a later version to open it.

Have been using NOF since about 2004, starting with NOF8, upgraded to NOF9 and updated to v9.10.0000.5039, which is current.
After a hard drive failure a few years ago, I reloaded NOF9 onto a new drive (Win XP), put my backup 'site folder' into the NOF User Sites folder and carried on.
Similar thing has happened again so loaded NOF9 onto my laptop drive (Win 10), put my backup 'site folder' into NOF User Site folder, but now find that site will not open..........saying 'site made with a later version of NOF'. I don't understand this, as I have never had or used a later version than I now have! If anyone can help please, without getting too technical, I'll be very grateful.
Thanks a lot,
Ian.